Embedded C book

Any free book/articles for embedded C programming, logic building or (arrays and pointers), since mostly arm programming is playing around arrays and pointers.

I appreciate your suggestions.

Google is your friend.

Lots on the internet:

https://www.google.ca/search?q=arduino+filetype%3A+pdf&rlz=1C9BKJA_enCA739CA739&oq=arduino+filetype%3A+pdf&aqs=chrome..69i57j69i65.1385j0j7&hl=en-US&sourceid=chrome-mobile&ie=UTF-8

https://www.google.ca/search?q=c%2B%2B+filetype%3A+pdf&rlz=1C9BKJA_enCA739CA739&oq=c%2B%2B+filetype%3A+pdf&aqs=chrome..69i57.22790j0j7&hl=en-US&sourceid=chrome-mobile&ie=UTF-8

http://imagecraft.com/products/getting-started/c-4-everyone-book
From the authors of the IMAGEcraft C compiler for avr....

C for everyone is a good book, but it is not free.